gshp in florida ac only

[rhino 660]

i have read most of the heat pump manifesto and joined the site because of it
i am the installer for a solar pv and thermal company.

my soil temp is 70* from 2' to 6' didnot go farther
my plan was to retrofit my existing ac system with a refrigerant to water heat exchanger on the condenser side like this one
www .aquasystemsinc. com/models_test.html Aqua Systems efficient Liquid to Refrigerant Heat Exchangers there only $140 for the 2 ton unit. the owner is very helpfull and has some geo thermal experience
and connect a slinky loop field to the exchanger and cool the condenser
but now i plan on using a FHP 24,000btu geothermal heatpump (Florida Heat Pump)
my house is 1000 sq ft and i have a 2 ton ac unit and resistance heating

i have plenty of space for a slinky coil trench and maybe free access to a backhoe.

my plan is to dig down 6' where the soil is very moist and lay my slinky.

the heat exchanger guy gave me a figure of 100' of trench per ton with 400' of pipe in the 100' trench

i have also heard that 600 foot of pipe slinky will fit in 65' of trench im guessing tighter spacing.

i was thinking of diging 3 trenches around 80' long 3' wide and 6' deep
and putting in around 750' of pipe in each trench. i located 800' roles of hdpe 3/4'' pipe which would leave me 25' extra on each input and output to reach my heat exchanger with no welds at all

any helpfull insite i think i have it figured out it seems simple
do you think i should see a large efficiency increase based on my soil temp of 70*


thanks joe
sebring fl 33876